Radioiodinated naphthylalanine derivatives targeting pancreatic beta cells in normal and nonobese diabetic mice
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Updated: Jul 5, 2026
A Method for Mouse Pancreatic Islet Isolation and Intracellular cAMP Determination
Published on: June 25, 2014
John K Amartey1, Yufei Shi, Ibrahim Al-Jammaz
1Cyclotron and Radiopharmaceuticals Department, King Faisal Specialist Hospital and Research Centre, PO Box 3354, Riyadh 11211, Saudi Arabia. amarty@kfshrc.edu.sa
Abstract:
An imaging method capable of using a signal from pancreatic beta cells to determine their mass would be of immense value in monitoring the progression of diabetes as well as response to treatment. Somatostatin receptors (SSTRs) are expressed on beta cells and are a potential target for imaging. The main objective of this study was to investigate whether pancreatic beta cells are a target for radiolabeled naphthylalanine derivatives. The molecules were subjected to in vitro and ex vivo evaluations. Pancreatic uptake of radioactivity was lower in nonobese diabetic (NOD) mice than normal mice at all time points investigated (P < .05) and correlated with the number of islets in tissue sections of both control and NOD mice. Immunohistochemical and confocal fluorescent microscopic studies showed colocalization of insulin and the conjugate radioligand in the pancreas. The results demonstrated that pancreatic uptake is receptor-mediated, and that beta cells are the primary target.
Insights
This study shows radiolabeled naphthylalanine derivatives can target pancreatic beta cells for imaging. This offers a new way to monitor diabetes progression and treatment response.
Area of Science:
- Biomedical imaging
- Endocrinology
- Diabetes research
Background:
- Developing imaging methods for pancreatic beta cells is crucial for diabetes management.
- Somatostatin receptors (SSTRs) on beta cells present a potential imaging target.
- Radiolabeled tracers are needed to visualize beta cell mass and function.
Purpose of the Study:
- To investigate pancreatic beta cells as a target for novel radiolabeled naphthylalanine derivatives.
- To assess the potential of these derivatives for imaging beta cell mass.
- To evaluate receptor-mediated uptake in pancreatic beta cells.
Main Methods:
- In vitro and ex vivo evaluations of radiolabeled naphthylalanine derivatives.
- Assessment of pancreatic uptake of radioactivity in nonobese diabetic (NOD) and normal mice.
- Immunohistochemical and confocal fluorescent microscopy for colocalization studies.
Main Results:
- Pancreatic uptake of radioactivity was significantly lower in NOD mice compared to normal mice.
- Radioactivity uptake correlated with islet number in both control and NOD mice.
- Microscopy confirmed colocalization of insulin and the radioligand in pancreatic beta cells.
Conclusions:
- Pancreatic uptake of radiolabeled naphthylalanine derivatives is receptor-mediated.
- Beta cells are the primary target for these novel imaging agents.
- This approach shows promise for non-invasive imaging in diabetes research.
